Gassing in transformer oil at low and high frequency vibration

Korobeynikov, S. M.; Bychkov, A. L.; Ridel, Alexandrl V.; Anikeeva, M. A.

doi:10.1109/ifost.2016.7884280

Cited by 7 publications

(7 citation statements)

References 2 publications

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“…Upon further vibration pressure increased, the data started to move into the high-temperature fault zone (T3). The experimental results are similar to those of S. M. Korobeynikov [14].…”

Section: Role Of Vibration In Dgasupporting

confidence: 88%

“…To test the effectiveness of the proposed assistant triangle in distinguishing characteristic gases generated by vibration from those generated by discharge and thermal faults, S. M. Korobeynikov's results and 117 cases of identified fault types were put into the triangle [1,5,14,21,[46][47][48][49][50]. Figure 12 shows that data of vibration-induced characteristic gas fell in the V zone, and most of the other fault data fell in the corresponding fault zones.…”

Section: Diagnostic Methods Of Vibration-induced Characteristic Gasmentioning

confidence: 99%

“…In 2013, for example, S. M. Korobeynikov et al explored the bubbling phenomenon and dissolved gas properties under vibration at 100 Hz in degassed oil; they found that bubbles formed in the narrow gaps, hydrogen (H 2 ), methane (CH 4 ), low amounts of ethylene (C 2 H 4 ), and acetylene (C 2 H 2 ) were detected in transformer oil after vibration [13]. Subsequently, in 2016, they further explored the composition of characteristic gases under high-frequency vibration with 29 kHz in transformer oil [14]. However, the relationship between the generation of characteristic gases and vibration intensity in transformer oil is still not clear.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on gas generation characteristics in transformer oil under vibration

Guo

Zhang

et al. 2022

IET Generation Trans & Dist

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Operating experience has shown that characteristic gases can be found in oil-immersed power transformers and high-voltage reactors under strong vibration without discharge or thermal faults occurring. This will cause misdiagnosis of Dissolved Gases Analysis (DGA). In this study, generation characteristics and mechanism of characteristic gases in transformer oil dependent on vibration are investigated. The results show that there is a vibration pressure threshold that makes characteristic gases such as hydrogen (H 2 ), methane (CH 4 ), ethylene (C 2 H 4 ), ethane (C 2 H 6 ), and acetylene (C 2 H 2 ) appear in transformer oil. The concentration of each characteristic gas increases with the increase of vibration pressure. Furthermore, misdiagnosis of insulation status which may be caused by vibration is illustrated based on Duval triangles method. Besides, vibration bubbling phenomenon in the experiment is observed. The generation mechanism of characteristic gases is analyzed with bubble dynamics under vibration. Higher vibration pressure induces cavitation processes and creates local thermal effects, which is the main reason for the generation of characteristic gases. A method based on combination of Duval triangle 1 and assistant triangle is proposed to distinguish characteristic gases generated by vibration from those generated by discharge and thermal faults. The results may provide theoretical support for fault identification and insulation state assessment of oil-immersed power transformers and high-voltage reactors.

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“…Upon further vibration pressure increased, the data started to move into the high-temperature fault zone (T3). The experimental results are similar to those of S. M. Korobeynikov [14].…”

Section: Role Of Vibration In Dgasupporting

confidence: 88%

Section: Diagnostic Methods Of Vibration-induced Characteristic Gasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation on gas generation characteristics in transformer oil under vibration

Guo

Zhang

et al. 2022

IET Generation Trans & Dist

View full text Add to dashboard Cite

show abstract

“…Heinrichs found that microbubbles intermittently appeared in transformer oil when experimental devices vibrate [14]. Subsequently, Korobeynikov et al explored the bubbling phenomenon with a vibrational frequency of 100 Hz in degassed oil; they found that bubbles initiated in the narrow gaps, and the vibrational cavitation process was considered to be the cause of bubble initiation [15,16]. However, the condition of bubble initiation at the transformer oil gap under vibration is still not clear.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Mechanism of Bubble Initiation in Transformer Oil Induced by Vibration

Guo

Zhang

Jing-en

et al. 2023

Preprint

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Operating experience has shown that vibration can cause pressure fluctuations and initiate bubbles at the oil gap, which seriously threatens the insulation properties of oil-immersed power equipment. The main aim of this study was to determine the characteristics and mechanism of bubble initiation at the transformer oil gap under vibration in this paper. The results show the existence of the vibration-dependent bubbling phenomenon at the oil gap. Interestingly, bubbles initiate during the process of gap expansion, and the evolution of bubble morphology was further analyzed. The threshold characteristic of the bubble initiation process was found, and the relevant influencing factors were experimentally obtained. In the range considered in this study, higher gas content, higher temperature, and lower moisture content are conducive to bubble initiation at the oil gap under vibration, while vibrational frequency does not affect the threshold characteristic of bubble initiation process. The vibration-dependent bubbling phenomenon can be attributed to the vibration-induced cavitation process caused by the decrease in pressure at the oil gap. The influence mechanism of the above factors on the threshold characteristics of bubble initiation was further discussed. This study contributes to providing a reference for risk assessment of abnormal vibration of oil-immersed power equipment.

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“…Figure 1 depicts the significant components of the power transformer source of vibration. This resulted in cavitation within the oil and gas generation [24,25], while Figure 2 FIGURE 2 Picture of deformed windings [37] shows a crooked transformer winding caused by vibration. The vibration may lead to winding deformation, and deformity might be the source of the bubbles.…”

Section: Introductionmentioning

confidence: 99%

Bubble migration characteristics in power transformer oil under coupled stresses of forced vibration and electrical field

Ladislas

Liu

et al. 2022

IET Science Measure & Tech

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The stresses existing in power transformers lead to the generation of bubbles. They are the primary source that worsens and leads to insulation failure. Due to the complexity of bubble dynamics, it is challenging to figure out bubble mechanisms. However, creation, migration, and accumulation mechanisms require further explanation. A set of experiments has been conducted to provide a scientific overview of bubbles. The results revealed that buoyancy is dominant in low electric fields, while high electric fields affect bubbles' rise. Bubbles stretch and oscillate while moving. When the electric field is not strong, the AC field reduces the duration and volume of bubble detachment. Vibration stress on the other side is leading the bubble motion including detachment frequency and migration speed. Under the combination of AC and vibration stresses, the bubble distortion degree aggravates and bubble gathering formation is easy. This research can provide a deeper acumen of the bubble's actions beneath a power transformer under a combination of vibration and electric fields. It provides essential technique parameters to deal with while investigating bubble's problems and related engineering research areas.

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Gassing in transformer oil at low and high frequency vibration

Cited by 7 publications

References 2 publications

Investigation on gas generation characteristics in transformer oil under vibration

Investigation on gas generation characteristics in transformer oil under vibration

Characteristics and Mechanism of Bubble Initiation in Transformer Oil Induced by Vibration

Bubble migration characteristics in power transformer oil under coupled stresses of forced vibration and electrical field

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